content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ----------------------------
   * IntervalCategoryDataset.java
   * ----------------------------
   * (C) Copyright 2002-2008, by Eduard Martinescu and Contributors.
   *
   * Original Author:  Eduard Martinescu;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * Changes
   * -------
   * 19-Mar-2002 : Version 1 contributed by Eduard Martinescu.  The interface
   *               name and method names have been renamed to be consistent with
   *               existing interfaces (DG);
   * 06-Jun-2002 : Updated Javadoc comments (DG);
   * 24-Oct-2002 : Categories and series are now indexed by int or Comparable,
   *               following changes made to the CategoryDataset interface (DG);
   * 12-May-2008 : Updated API docs (DG);
   *
   */
  
  package org.jfree.data.category;
  
  /**
   * A category dataset that defines a value range for each series/category
   * combination.
   */
  public interface IntervalCategoryDataset extends CategoryDataset {
  
      /**
       * Returns the start value for the interval for a given series and category.
       *
       * @param series  the series (zero-based index).
       * @param category  the category (zero-based index).
       *
       * @return The start value (possibly <code>null</code>).
       *
       * @see #getEndValue(int, int)
       */
      public Number getStartValue(int series, int category);
  
      /**
       * Returns the start value for the interval for a given series and category.
       *
       * @param series  the series key.
       * @param category  the category key.
       *
       * @return The start value (possibly <code>null</code>).
       *
       * @see #getEndValue(Comparable, Comparable)
       */
      public Number getStartValue(Comparable series, Comparable category);
  
      /**
       * Returns the end value for the interval for a given series and category.
       *
       * @param series  the series (zero-based index).
       * @param category  the category (zero-based index).
       *
       * @return The end value (possibly <code>null</code>).
       *
       * @see #getStartValue(int, int)
       */
      public Number getEndValue(int series, int category);
  
      /**
       * Returns the end value for the interval for a given series and category.
       *
       * @param series  the series key.
       * @param category  the category key.
       *
       * @return The end value (possibly <code>null</code>).
       *
       * @see #getStartValue(Comparable, Comparable)
       */
      public Number getEndValue(Comparable series, Comparable category);
  
  }
  